JPH0388507U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a pulse oximeter according to an embodiment of the present invention, FIGS. 2 and 3 are diagrams explaining the operation of the same embodiment, and FIGS. 4 to 6 are diagrams showing other embodiments of the present invention. FIG. 7 is a diagram illustrating the operation of the embodiment according to FIGS. 5 and 6, respectively. 1, 2... Light emitting element, 3... Light receiving element, 9, 3
9...Probe, 10,30...Thermistor.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a pulse oximeter that measures the oxygen saturation level in blood from the amount of light transmitted through a measurement site that is set between a light emitting element and a light receiving element that face each other, A temperature sensor is placed near the light emitting element so as to be in contact with it, and the detected temperature detected by this temperature sensor is compared with a reference temperature corresponding to the possibility of causing low-temperature burns.When this reference temperature is reached, an abnormal temperature is detected. A pulse oximeter comprising: temperature rise determining means for outputting a signal; and reporting means for notifying an abnormality in response to the abnormal temperature signal. 2. The light receiving device according to claim 1, further comprising a light amount reduction detection means for detecting that the amount of light incident on the light receiving element is reduced due to the setting of the measurement site compared to when it is directly irradiated, and starting the temperature rise determination means. Pulse oximeter as described. 3. The pulse oximeter according to claim 1 or 2, further comprising timer means for delaying the start of operation of the temperature rise determining means. 4. Calculate a temperature change curve in which the detected temperature detected by the temperature sensor moves toward the temperature equilibrium state after setting the measurement area so as to delay the start of operation of the rising temperature determination means until the detected temperature reaches an equilibrium state. The pulse oximeter according to claim 1 or 2, further comprising temperature equilibrium detection means for detecting the point at which the temperature has been reached. 5 In addition to the temperature sensor placed near the light emitting element so as to contact the measurement site, there is also a temperature sensor placed in the vicinity of the light emitting element so as to contact the measurement site at a position spaced apart from the light emitting element to the extent that a temperature increase due to heat generation of the light emitting element does not occur. The temperature increase determining means is configured to detect a temperature difference between the two temperature sensors and output an abnormal temperature signal when this temperature difference exceeds a reference temperature difference. ing,
The pulse oximeter according to claim 1, characterized in that: 6. In a pulse oximeter that measures oxygen saturation in the blood from the amount of light transmitted through a measurement site set between a light emitting element and a light receiving element facing each other, a pulse oximeter is placed near the light emitting element so as to make contact with the measurement site. a disposed temperature sensor; an error signal generating means for comparing the detected temperature detected by the temperature sensor with a reference temperature that is not likely to cause low-temperature burns and outputting an error signal; and in response to the error signal. A pulse oximeter comprising: drive current control means for increasing/decreasing the drive current of the light emitting element. 7 In addition to the temperature sensor placed near the light emitting element so as to contact the measurement site, there is also a temperature sensor placed in the vicinity of the light emitting element so as to contact the measurement site at a position spaced apart from the light emitting element to the extent that a temperature increase due to heat generation of the light emitting element does not occur. Further, the error signal generating means is configured to compare the temperature difference between the two temperature sensors with a reference temperature difference and output an error signal. Claim 6
Pulse oximeter as described in. 8 Equipped with an equilibrium temperature prediction means for predicting an equilibrium temperature by calculating a temperature change curve in which the detected temperature moves toward a temperature equilibrium state after the measurement part is set, and having the temperature increase judgment means compare the predicted equilibrium temperature with a reference temperature. The pulse oximeter according to claim 1, characterized in that: 9 In addition to the temperature sensor placed near the light emitting element so as to come into contact with the measurement site, there is also a temperature sensor placed in the vicinity of the light emitting element so as to contact the measurement site at a position spaced apart from the light emitting element to the extent that a temperature increase due to heat generation of the light emitting element does not occur. Equilibrium temperature difference prediction, in which an equilibrium temperature difference is predicted by providing another temperature sensor arranged at the same time and calculating a temperature difference change curve in which the temperature difference detected by both temperature sensors moves toward a temperature equilibrium state after the measurement site is set. the temperature increase determining means compares the predicted equilibrium temperature difference with a reference temperature difference corresponding to the possibility of causing low-temperature burns, and outputs an abnormal temperature signal when the reference temperature difference is reached. The pulse oximeter according to claim 1, wherein the pulse oximeter is configured to: